during the pump down and hot gas phases depends on parameters F2 and F3. During the dripping
phase the fan is always off, while during the post-dripping phase operation depends on the setting of
parameter Fpd.
Code Description Def Min Max UOM User
User
terminal
dd
Dripping time after defrost (fans off)
0 = no dripping
2 0 15 min S NO
dH1
Pump down phase duration
0 = pump down disabled
0 0 999 s M NO
F2
Evaporator fans with compressor off
0 = see F0
1 = always off
1 0 1 - S NO
F3
Evaporator fans during defrost
0/1 = on/off
1 0 1 - S NO
Fd Post-dripping time after defrost (fans off with control active) 1 0 15 min S NO
cP1 Initial valve position when control starts 30 0 100 % M NO
Pdd Initial valve position maintenance time after defrost 10 0 30 min S NO
dSb
Valve position during defrost
0: as defined by the type of defrost
1: forced closed
2 to 100: opening percentage
0 0 100 % M NO
5.3.2 Advanced parameters
Maximum interval between consecutive defrosts (par. dI)
Code Description Def Min Max UOM User
User
terminal
dI Maximum interval between consecutive defrosts 8 0 240 hours S YES
Parameter dI is a safety parameter used to perform cyclical defrosts every “dI” hours. It is also useful if the
LAN or RS485 serial network is disconnected. At the start of each defrost, irrespective of the duration, an
interval starts being counted. If this interval exceeds dI without a defrost being performed, one is started
automatically. The count is always active even if the controller is OFF. If set on the Master controller, the
parameter affects the entire connected LAN subnet, while if set on a Slave controller, it only has an effect
locally.
Example.
If the defrosts are controlled by a centralised system and there is no communication, the request will not
be received, so after the safety time a defrost is started automatically.
Fig.5.s
Ref. Description
dI
Maximum interval between consecutive
defrosts
td1…td3 Scheduled defrosts
Ref. Description
t time
DEF Defrost
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